A 10 screw would be about 0.190 diameter.
A 12 screw would be about 0.215 diameter.
A 1/4 screw would be about 0.245 diameter.
What is the pitch? How many threads per inch? Just count the number of threads along a ruler. If it's not an inch long count the threads in a half inch and double it. Don't count the thread you start from.
But, being old and German, everything above is probably moot.
How does it work? Do you have to loosen the screw before adjusting the string tension?
If not, Green loc-tite will fill up to 0.015 gap and hold with a death grip.
Red loc-tite won't fill much gap, but will hold tight and be removable, if the threads are fairly close.
Blue loc-tite will keep fairly snug threads from moving.
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